Thanks Rurwin - I see your point, though I don't quite understand why Linux would not be able to do so. You do have software synths that run very well on *any* Linux, or audio tools/filters/stomp-boxes. Just to make sure : after many many years of WinDos, I only started using Linux a few month ago - so I have no in-depth Linux knowlegde yet. So, I'm not even considering bare-system programming.
And no, I don't believe 44.1kHz-24bit would be required while still having all the fun (and my ears don't reach anything further than 22kHz-14bit ...
). Also note that every single module would be one single RPi. So basically total CPU capacity would be times-n. A VCO would only need to oscillate - a VCA only to amplify. Well, you know the picture.
I'm afraid I don't understand the 5us latency you suggest. I would be more then happy if any module would be as responsive as 1ms - in e.g. a 10 module chain (which is already a fairly long chain), that would still only be 10ms which is hardly noticable I would think. But I probably understand it wrong.